Fix warning handler?

docker/wp-config.php

@@ -187,11 +187,10 @@ if (array_key_exists('debug_cookie_name', $noblogs_config) &&
     set_error_handler(function($severity, $message, $file, $line) {
         if ($severity & (E_WARNING | E_NOTICE | E_USER_WARNING | E_USER_NOTICE)) {
             $ex = new WarningWithStacktrace($message, 0, $severity, $file, $line);
-            echo "\n" . $ex . "\n\n";
+            error_log("\n" . $ex. "\n");
             return true;
-        } else {
-            throw new ErrorException($message, 0, $severity, $file, $line);
-        }
+        } 
+        return false;
     });
 
 } else {